Since I made my little Atmega16 avr development board I wanted to make a program to read out a Wiimotion Plus which I bought from Dealextreme for about 12 bucks. The Wiimotion Plus works with the Two Wire Interface (TWI/I2C) and since I already got the protocol working with an EEPROM chip I needed to do some investigation on this WM+. This wasn’t a big problem since I do have a Bus Pirate which is a super awesome tool for interfacing new chips without writing code! So I did not have to worry about writing code, I only had to try and find the right commands to put on the I2C communication line. So I played with the Bus Pirate and the WM+ for some time and found out that its real easy to interface the WM+.
J-J Shortcut's Blog 